says there's insufficient evidence to say if the second was made from was made from a pressure cooker, as well. residents are trying to get back to their lives. >> we're a strong people, and we're not going to let anyone push us around of the you mess with one of us, you mess with all of us. >> reporter: officials have received a number of tips and are following up, and the president heads here for a service honoring victims tomorrow. >> understandably security has to have been heightened but is it still noticeably high? >> reporter: you know, it is, but i don't think it's quite like it was yesterday, diana. you don't see as many cops on the street. yesterday you saw national guard out operating, and you saw men with machine guns standing on many of the corners here in downtown boston. now, we expect there will be another strong show of force, but law enforcement officials say that there are no unexploded devices across the city. there were just those two planted bombs. people are still on edge, but it's not quite the police presence that we saw yesterday. >> all right, tahman bradley in

boston, thank you. >> and, you know, tahman just briefly touched on the investigation into those bombings. >> yeah, of particular interest this morning is what's left of that common pressure cooker. that's where abc's brian ross continues our coverage. >> reporter: this is what remains of the pressure cooker turned into a homemade bomb seen in this fbi crime lab photo obtained by abc news. it was hidden in a black backpack. the simple bombs were responsible for 12 seconds of horror. cell phone footage shot by a spectator between the two explosions. authorities are going through race day videos frame by frame. here the white smoke seen after the detonation indicates a bomb built with low velocity explosive mixtures, not the more powerful military grade. >> they may not have had the

resources as we've seen in other bomb attacks, but they knew how to make the bomb go boom. >> reporter: but tuesday there was a new plea for help in identifying the bomber. >> any individual who expressed a desire to target the marathon, suspicious interest in researching how to create explosive devices, the noise of explosions in remote areas prior to yesterday, which may have been used as tests by those responsible for these acts. >> reporter: the efforts to learn who is behind the bombing often require great patience and persistence. it took three years and only after the discovery of a tiny electronic part that authorities learned who was behind the bomb that brought down pan am flight 103. the so-called unabomber was at large for some 17 years hiding out in the mountains of montana in a cabin before a relative finally turned him in. in oklahoma city authorities got lucky in a few days tracing the debris of the truck bomb and its axle to the rental firm and then to bomber timothy mcveigh. mike sullivan, the former head

of the atf, the federal agency that investigates bombings, gave me insight tuesday near the boston crime scene. >> the smallest piece of evidence we would look at and simply walk over they would capture and say that's a treasure trove for them. >> reporter: even a little piece like that. >> yeah, critically important. you know, it could be the one piece that might tell them exactly how the device was detonated, and that might be the only piece that's left. >> reporter: brian ross, abc news, boston. so many families toughed by the tragedy in boston. we will have more on their stories later in this half hour and, of course, complete coverage coming up on "good morning america." and now we want to get to a brief check of the nation's weather. there will be clear skies from new england and the northeast. rain from the carolinas into the deep south. but violent storms stretch from texas all the way into the midwest, and then more snow from the northern plains and rockies. >> temperatures in colorado remain well below normal. low 80s across the southeast. 50s around the great lakes and seasonable readings up and down the east coast. coming up, it's happening

right now, the funeral of margaret thatcher, and we're going live to london. back on the air, what american airlines is offering passengers from a computer glitch grounded its entire fleet in a live report. and a mother's wish for her two sons, both of them injured in boston. her story straight ahead.

developing overnight, senator chuck schumer appeared on the senate floor at around 2:00 a.m. to officially file a bipartisan immigration reform bill. the legislation would secure borders, revamp legal immigration, boost workplace enforcement and put 11 million people in the u.s. illegally on the path to citizenship. and a scare on capitol hill. according to missouri senator claire mccaskill, investigators have identified a suspect who may have sent a suspicious letter to one of her colleagues. that letter was addressed to

mississippi senator roger wicker. preliminary tests show the presence of the potentially lethal poison ricin. more extensive testing on that letter is now under way. travel nightmare for thousands of travelers after a computer glitch forced american airlines to ground its entire fleet. even though the problem has been fixed, more cancellations expected today. the latest from abc's preeti arla. >> reporter: american airlines hopes to get its flights off the ground today but still won't be running at full speed. the airline said it fixed a problem with its computer network that left tens of thousands stranded yesterday. still, there is a backlog after the airline grounded all of its planes. >> we're waiting to see what is happening. they say they'll make reservations for us in a hotel or get on a flight today, but we don't know. >> reporter: from dallas to chicago to miami, planes sat on the tarmac, and passengers waited in long lines. in all nearly 1,000 flights canceled and hundreds more

delayed. >> the positive aspect is everybody is being very pleasant. the not so great aspect is we have no idea when we're going to get home. >> reporter: the computer glitch left ticket agents unable to access information and the airlines operation center had no way to update schedules or even track bags. a huge frustration for passengers. >> just trying to see when i'm going to get home, you know. i got my poor baby at home waiting for me. >> reporter: and a huge embarrassment for the nation's third largest airline, which is preparing to merge with us airways to become the world's biggest carrier. >> we're responsible for getting you to business meetings, vacations and to see your family and friends, and that's a responsibility we take very seriously, and we don't like to let you down. >> reporter: american offered to book passengers on other airlines so they could get to where they needed to go. they'll also offer refunds to stranded passengers. diana? >> all right, preeti arla in

washington for us to morning. thank you. and now to london where security is extremely tight this morning for the funeral of former british prime minister margaret thatcher. abc's lama hasan joins us now on the phone from st. paul's cathedral. lama, what's the mood there this morning? >> reporter: yeah, good morning to you, diana. well, i would describe it as somber and symbolic. symbolic because this is a ceremonial funeral with full military honors normally reserved for senior members of the royal family like what we saw for princess diana and the queen mother 11 years ago. this has been awarded to honor britain's first female prime minister. now, the ceremony will be a solemn ceremony at st. paul's cathedral watched by 2300 guests. mourners from 170 countries including the queen and prince philip. this is the queen's first funeral of a prime minister since winston churchill's funeral in 1965. now, leading the u.s. delegation is james baker, george shultz, henry kissinger and dick cheney, and as you rightly said, security is tight.

security offices have been on heightened alert in the wake of the boston bombings. attention has slightly switched from policing the protesters, who wanted to disrupt the procession when the coffin passed them by turning their backs to the coffin in a sign of disrespect while the security officers have now turned their attention to policing the whole area. 4,000 police officers are on duty fanning out across the city in an operation costing more than $5 million. diana. >> all right, lama hasan live for us in london this morning. thank you, lama. and coming up next on this wednesday, more from boston including the newtown connection, two towns, two tragedies. >> and lessons learned from the young victims. my family to eat breakfast, i need all the help i can get. that's why i like nutella. mom, what's the capital of west virginia? charleston. nutella is a delicious hazelnut spread my whole family loves. mom, have you seen my -- backpack?

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dumped heavy snow across the region. players had a little fun before the crews descended on the field with the shovels. even the rockies owner and coaches pitched in. and it's not going to be a whole lot better with more snow falling on roads from denver all the way into the northern plains. storms threatened both commutes today across the nation's midsection, and it could be a slightly wet morning rush hour in the northeast. now if you're flying, airport delays are possible in dallas, kansas city, chicago, minneapolis and denver. all right. here are the latest headlines on the boston bomb investigation. the fbi has sent a bulletin to law enforcement agencies showing what appears to be a mangled partially exploded pressure cooker, and the shredded bag believed to have hidden one of the devices. >> investigators have recovered a partial circuit board that may have been used to trigger the bomb but the fbi says the range of suspects and motives remains wide open. president obama travels to boston tomorrow for a memorial service.

and ahead of that service, the three victims killed in the blast being remembered this morning. abc's terry moran continues our coverage. >> reporter: a candlelight vigil in the tight-knit neighborhood of dorchester for one of their own, a beautiful gap-toothed 8-year-old boy named martin richard, killed at the finish line of the marathon just after getting some ice cream. there is so much love here. >> we're here for support and love. that's what we do. >> reporter: they are dorchester strong, and they came out for martin and for his family who are suffering so much. here a family facebook photo, his mother denise recovering now from severe head injuries, his 6-year-old sister jane who lost a leg, his brother henry and his father bill. what does this do for you to be here? >> if it happened to my family, i know they'd be here for me. >> respect. it's terrible, it's awful, especially for the mother and the daughter. it's awful. >> reporter: neighbors dropped off flowers at the martin home. the clock in the center of town was stopped at the moment he was killed, and at a park where he

used to play, children scrawled "pray for martin." >> when they announced it, i was like is it this martin, and then when i saw the last name i was like, yeah, and i thought it was very sad. >> reporter: so we grieve for martin richard, and we learned another name, another of the dead of the boston marathon. >> we are heartbroken about krystle marie. >> reporter: krystle marie campbell was 29 years old. she was at the marathon cheering on her friend's boyfriend. she was a manager at jimmy's steak house. she took care of her sick grandmother, and her dad, william campbell, told us she was every father's dream. her mother patty spoke outside her home. >> she was always smiling. i couldn't ask for a better daughter. we can't believe this has happened. she was such a hard worker at everything she did. this doesn't make any sense. >> reporter: the third victim in the bombing, a chinese graduate student at boston university.

her family in china has asked that her personal information not be disclosed. when the bombs went off, we knew evil was at work but so was good. it always is. >> but we also as a community and as a city can come together. >> reporter: even in darkness there is light. >> and that was our terry moran. among those recovering from severe injuries are two brothers and each of them lost a leg. 33-year-old j.p. norden and his younger brother paul were at the marathon cheering on a friend when those bombs hit. each one of them went to the hospital not knowing what had happened to the other. their mother spoke to "good morning america's" josh elliott. >> what were those moments like when you first saw your boys? >> terrible. i wish i could take their place for them. it's terrible. for all those people it's -- it's just like i want to wake up and have it not be real. >> and their sister described what it was like to have her brothers in two different

hospitals. >> the first question they have asked, they just keep asking about each other. >> that makes me happy to know that they're not caring to know like one is worried about the other one and knows his leg is gone and just like heartbreaking to me. >> those brothers made it through surgery okay but face a long road to recovery. for runners from newtown, connecticut, the explosions brought back painful memories of their own town's tragedy. tom abrams wasn't far from the finish line when the bombs went off. he was running to raise money for victims of december's shooting at sandy hook elementary school. his wife watched the horror unfold on tv. >> i cried again just like i did on 12/14. what newtown is trying to do is spread the message that it's not just about newtown. it's about all of us working together to create a safe community, a safe country. my heart goes out to those injured, and my heart goes out to those families.

>> people in newtown have vowed to reach out to the people of boston just like people across the country did for them in december. the bombings have only made runners and organizers more committed on carrying on the tradition of the boston marathon. asked if the race will go on next year, organizers replied with an emphatic yes. one local congressman predicted twice the crowd next year. the marathon dates back 117 years. and the london marathon is this weekend. runners and spectators will observe 30 seconds of silence in memory of the boston victims and will wear black ribbons. despite security concerns, prince harry still plans to attend. all right, up next what native bostonian mark wahlberg told jimmy kimmel he wants to do to his kids after the bombing. plus, showing respect. what the archrival new york yankees did for fans of the boston red sox. to do the things that i wanted.

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neil diamond's "sweet caroline" there, fan favorite in boston's fenway park but last night played at yankee stadium to honor the victims of marathon attack and to salute boston's resilient spirit. diamond responded on twitter telling the yankees, "you scored a home run in my heart." massachusetts native mark wahlberg appeared on "jimmy kimmel live" last night expressing his grief and frustration over the boston bombing. wahlberg told kimmel he's grateful his family and friends were spared and that he's ready and willing to do what he can for the victims. >> we have some people that we know that were affected by it, and, you know, we just got to do everything that we can to help those families, and obviously we

have to do everything we can to start protecting our women and children and people in our country. i just wanted to rush home today and hug my kids, and, you know, it's a crazy world that we're living in. >> wahlberg added a request that everyone pray for the victims. all right, and here is the cover of the new "sports illustrated," maybe the defining image of the boston marathon attack. three police officers and that 78-year-old runner just moments after the first bomb blast. bill iffrig got back on his feet and crossed that finish line. " because walgreens balance rewards is more than a savings card. it's a rewards card that gives you 500 rewards points every time you fill a prescription. points you can redeem in store or online for, well, almost anything. rack up points with each prescription you fill, right here. at the corner of happy and healthy. [ female announcer ] some prescriptions not eligible to earn points. restrictions apply. see website for details.

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>> live from the kgo-tv broadcast center this is abc7 news. an outpouring of emotion as the community honors and remembers the victims of the boston marathon bombings at the first of many vigils takes place. investigators hone in on critical clues to lead them to whoever was behind the attack. >> good morning on this wednesday, 4:28. i am kristen sze. >> i am eric thomas. first, a look at the weather

forecast. >> meteorologist, mike nicco. >> good morning. it is dry this morning. no need to worry about wet weather. we will talk about the winds at 24 in fairfield and napa the 21 in livermore. 26 at sfo. half moon bay at 24. san jose is calm. the forecast today is full of sunshine and warmer weather. 63 to 73 around the bay. 58 to 62 at the coast. low-to-mid 70's inland. leyla gulen? >> good morning, everyone, at 4:29. headed through oakland we have construction out there along the 23rd street off ranch. if you head along 880 it will be closed until 6:00 a.m. with slowing in the area. the rest of the drive is quiet. in pittsburg we have an ongoing project that started yesterday, on-ramp to eastbound highway four with an alternate out there to take leland to railroad to

get on highway 4 in the eastbound direction. westbound it is clear and accident-free today. the san mateo bridge is clear and dry. >> the f.b.i. is making an appeal to the public for photos, video, or any information that could lead to the bomber as they comb new clues uncovered at the site. for more we go live to abc7 news reporter in boston. >> no suspects here but in boston, you get a sense this is a city united an outpouring of support for the folks who are in the hospitals recovering and deep sympathy for the families of the victims who lost loved ones. >> overnight, boston grieves, a vigil in the neighborhood for martin richards just eight years old killed by the attack.

>> the boy's home, neighbors dropped off flowers and children remembered him in a park where he played. another victim, 29-year-old crystal campbell is remembered at the marathon cheering on her friend's boyfriend. >> i cannot believe this happened. everything she did... >> the third person killed has been identified as a boston university graduate student from china. it is not just boston with the heavy heart. at yankee stadium a teen tribute to the victims, sweet caroline played, a fenway park favorite. ♪ sweet caroline >> this morning, authorities are putting together more clues. we have obtained the photos of a shredded backpack and fresher cooker modified as a bomb. >> this device may have been dropped in a backpack inside the

trash can or right outside the trash can. >> an f.b.i. advisory says there is insufficient evidence to determine if the second explosive was made from a pressure cooker. authorities are asking the public to identify the bomber. boston is pulling together. police line the streets but residents are trying to get back to their lives. >> we are strong people and will not let anyone push us around. you mess with one of us, you mess with all of us. >> officials have received a number of trips. >> president obama heads here tomorrow to attend a service in honor of the victims. >> before you go, pressure cookers are so common, of course, so to what sent are authorities worried about them being used to make more bombs. >> counterterrorism for thes have long worried about the pressure cookers because they are widely available. in 2010 man tried to blow up times square using a